According to the IAB's report, which was prepared by PwC U.S., mobile accounted for 17% of 2013's total interactive advertising revenues at $7.1 billion, a 110% increase over 2012's $3.4 billion. At $12.8 billion, display made up 30% of the year's total ad revenues. Search revenues totaled $18.4 billion.

Interactive advertising revenues for Q4 were $12.1 billion, 17% more than they were over the same period in 2012, and 14% more than they were in Q3 ($10.6 billion).

“The news that interactive has outperformed broadcast television should come as no surprise,” IAB president and CEO Randall Rothenberg said in a statement. “The staggering growth of mobile is clearly a direct response to how smaller digital screens play an integral role in consumers' lives.”

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